adodb-compress-gzip.php

php聊天源码

<?php


/*
V4.01 23 Oct 2003  (c) 2000-2004 John Lim ([e-mail]). All rights reserved.
         Contributed by Ross Smith ([e-mail]). 
  Released under both BSD license and Lesser GPL library license.
  Whenever there is any discrepancy between the two licenses,
  the BSD license will take precedence.
	  Set tabs to 4 for best viewing.

*/

if (!function_exists('gzcompress')) {
	trigger_error('gzip functions are not available', E_USER_ERROR);
	return 0;
}

/*
*/
class ADODB_Compress_Gzip {
	/**
	 */
	var $_level = null;

	/**
	 */
	var $_min_length = 1;

	/**
	 */
	function getLevel() {
		return $this->_level;
	}

	/**
	 */
	function setLevel($level) {
		assert('$level >= 0');
		assert('$level <= 9');
		$this->_level = (int) $level;
	}

	/**
	 */
	function getMinLength() {
		return $this->_min_length;
	}

	/**
	 */
	function setMinLength($min_length) {
		assert('$min_length >= 0');
		$this->_min_length = (int) $min_length;
	}

	/**
	 */
	function ADODB_Compress_Gzip($level = null, $min_length = null) {
		if (!is_null($level)) {
			$this->setLevel($level);
		}

		if (!is_null($min_length)) {
			$this->setMinLength($min_length);
		}
	}

	/**
	 */
	function write($data, $key) {
		if (strlen($data) < $this->_min_length) {
			return $data;
		}

		if (!is_null($this->_level)) {
			return gzcompress($data, $this->_level);
		} else {
			return gzcompress($data);
		}
	}

	/**
	 */
	function read($data, $key) {
		return $data ? gzuncompress($data) : $data;
	}

}

return 1;

?>